"Eject after copy" not working properly; errors in OS X logs

[jkbull]

The drive disappears from the Desktop, but it keeps spinning, which is the same behavior I see if I use Disk Utility to "Unmount" it.

If I use Disk Utility to "Eject" it, it disappears from the Desktop and stops spinning. (In fact, the drive and all the volumes on it disappear from Disk Utility's left-side listing, too.)

If I "Eject" it from the Finder, it disappears from the Desktop and stops spinning. (It does not disappear from the left-side listing in Disk Utility if Disk Utility is already open, however, but it dims as if it were unmounted.)